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Cambridge IGCSE Physics revision notes
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Lesson
Lesson-12.1.1- Describe the production of sound by vibrating sources. Describe the longitudinal nature of sound waves.
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Lesson-12.1.2- State that the approximate range of audible frequencies for a healthy human ear is 20 Hz to 20 000 Hz
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Lesson-13.1.1- Describe the forces between magnets, and between magnets and magnetic materials.
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